700 11th Ave, 549-551 & 553-557 W 49th St, New York, NY 10019

Clinton

Brownfield VOCs CVOCs "Vapor Intrusion"

Site Description[1]
The Astor substation site was formerly called the Riverside Substation site. Con Edison, the project applicant, changed the project name to Astor Substation site in response to discussion with various community members in October 2005. The Astor substation site (~ 0.6 acres in size) is located along the eastern side of 11th Avenue between west 49th and West 50th Street in the Clinton section of the borough of Manhattan, city of New York, at latitude 40 degree 45' 57.2" and longitude 73 degree 59' 40.9", and designated as tax parcels Block 1078, Lots 1 and 5 on the Tax Map of the City of New York, New York County. The street address for the parcel is 700 11th Avenue (which also known as 549-551 and 553-557 West 49th Street), New York, NY 10019. During 1930 to 1940, the site had been used for gasoline filling station and automobile service garage. Prior to its acquisition by Con Edison on April 12, 2005, the site was owned and operated by Martin Motors Sales, Inc. (MMS) as a retail automobile sales and service facility. The area around the site is fully developed as commercial, residential and institutional uses to the east, north and south; with another Con Edison electrical substation located west of the site across 11th Avenue. The building on the site had been demolished in connection with Con Edison's redevelopment of the Site into an electrical substation that is needed to meet the increasing demand for power in midtown Manhattan. The site is currently being redevelop and the electrical substation construction is anticipated to be completed sometime in 2008. Investigations completed at the site include a Limited Phase II Environmental Site Assessment (January, 2005) and Remedial Investigation Report (November 2005). The volunteer has submitted and the Department has approved a Remedial Action Work Plan (RAWP) which involves excavation of soil at the entire site and the northern portion of 11th avenue sidewalk area along the western site property line down to top of bedrock surface. Contaminated media will be removal and properly disposed off-site. Implementation of the approved RAWP started on 4/25/06. Remedial construction was completed on February 2007. Remedial Action Report(RAR) date March 2007 and RAR addendums dated April 2007 and November 2007 respectively, collectively equivalent to a Final Engineering Report. FER was approved on 12/21/2007 and a Certificate of Completion was issued on 12/21/2007.

Site Environmental Assessment
Site investigations conducted prior and after implementation of the BCP agreement revealed that the presence of underground storage Tanks (USTs) that were associated with the former gas station or automobile repair facility; petroleum contamination in the northwest corner of the site (both on-site and off-site) in soil and groundwater, including petroleum product on the groundwater surface (up to 5 feet of separate-phase product has been detected in an off-site well in the vicinity of the former gasoline filling station located in the north west portion of the site); soil and groundwater near the location of a former oil/water separator in the garage area which is located south east of the site had been impacted by the former site uses (automobile service garage); Soil Gas sampling indicates the presence of VOCs, including both gasoline related compounds and chlorinated solvents (PCE, and TCE) that are consistent with findings in soil, groundwater, and pass site use, The remedial investigation report also identify a NYSDEC spill site (spill # 8904939 petroleum origin) is located at the southeast corner of west 51st street and 11th avenue about one block north of Astor substation site, these off-site properties may be contributing to the soil vapor detections; Low level of PAHs and Metals were detected from on site soil; Sediment samples from the floor drain in the service garage indicated the presence of PCE, TCE and gasoline related compounds with concentration above the TAGM4046 recommended soil clean up objective. The applicant had implemented the approved Interim Remedial Measures (IRM) to recover petroleum product identify in the on and off site wells since September of 2005. The thickness of the petroleum product in groundwater monitoring wells show significant drop as the result of the IRM activities. The quality exposure assessment indicated the lack of exposure pathways at the site because of the current ground surface is covered with impervious surface. DEC has determined, in consultation with NYSDOH, that the conditions at this site do not pose a significant threat to human health or the environment. The RAWP dated December 2005 was approved March 31, 2006 has been implemented. The FER has been approved and the COC issued in December 2007.

Site Health Assessment
Public water is provided to the area, thereby preventing exposures to groundwater. The site is currently covered with buildings and pavement, preventing direct contact exposures.

Contaminants of Concern
Type of Waste Quantity
BENZENE UNKNOWN
ETHYLBENZENE UNKNOWN
TETRACHLOROETHYLENE (PCE) UNKNOWN
TOLUENE UNKNOWN
TRICHLOROETHENE (TCE) UNKNOWN
XYLENE (MIXED) UNKNOWN

admin, Debra Hall

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